Fixed #25175 -- Renamed the postgresql_psycopg2 database backend to postgresql.

from django.db.backends.base.base import NO_DB_ALIAS

from django.db.backends.postgresql_psycopg2.base import \

from django.db.backends.postgresql.base import \

    DatabaseWrapper as Psycopg2DatabaseWrapper

from .features import DatabaseFeatures

from django.contrib.gis.db.backends.base.features import BaseSpatialFeatures

from django.db.backends.postgresql_psycopg2.features import \

from django.db.backends.postgresql.features import \

    DatabaseFeatures as Psycopg2DatabaseFeatures

from django.contrib.gis.gdal import OGRGeomType

from django.db.backends.postgresql_psycopg2.introspection import \

    DatabaseIntrospection

from django.db.backends.postgresql.introspection import DatabaseIntrospection

class GeoIntrospectionError(Exception):

from django.contrib.gis.geometry.backend import Geometry

from django.contrib.gis.measure import Distance

from django.core.exceptions import ImproperlyConfigured

from django.db.backends.postgresql_psycopg2.operations import \

    DatabaseOperations

from django.db.backends.postgresql.operations import DatabaseOperations

from django.db.utils import ProgrammingError

from django.utils.functional import cached_property

from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor

from django.db.backends.postgresql.schema import DatabaseSchemaEditor

class PostGISSchemaEditor(DatabaseSchemaEditor):